Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/jfree/JFreeUtil.java @ 4798:39885bdfc6fc

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Added calculation of the "Umhuellende" to calculation of "W fuer ungleichwertige Abfluesse". This is done by figuring out the WST columns that imfold the data and then do simple "gleichwertige" calculations from the start of the interval. This is too much because only the Qs are needed for the "Umhuellende".
author Sascha L. Teichmann <teichmann@intevation.de>
date Sun, 13 Jan 2013 16:18:28 +0100
parents 080411ac948f
children
rev   line source
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1 package de.intevation.flys.jfree;
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2
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3 import java.awt.Shape;
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4 import java.awt.geom.Rectangle2D;
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5 import java.util.Iterator;
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6 import java.util.Random;
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7
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8 import org.apache.log4j.Logger;
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9 import org.jfree.chart.entity.ChartEntity;
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10 import org.jfree.chart.entity.EntityCollection;
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11 import org.w3c.dom.Document;
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12
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13 import de.intevation.flys.artifacts.math.Function;
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14
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15 public class JFreeUtil {
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16
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17 private static final Logger logger = Logger.getLogger(JFreeUtil.class);
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18
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19 /** Do not instantiate. */
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20 private JFreeUtil() {
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21 }
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22
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23
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24 /**
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25 * True if \param hotspot collides with a Entity in \param entities.
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26 * @param hotspot Shape to compare against other shapes (bounds only).
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27 * @param entities entities against which to compare shape.
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28 * @param exclusiveEntityClass If not null, consider only entities of
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29 * given class.
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30 * @return true if a collision (non-zero intersection) exists between
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31 * shapes.
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32 */
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33 public static boolean collides(Shape hotspot, EntityCollection entities,
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34 Class exclusiveEntityClass) {
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35 if (entities == null) return false;
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36
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37 Rectangle2D hotspotBox = hotspot.getBounds2D();
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38
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39 for (Iterator i = entities.iterator(); i.hasNext(); ) {
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40 Object next = i.next();
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41 ChartEntity entity = (ChartEntity) next;
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42 if (exclusiveEntityClass == null
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43 || exclusiveEntityClass.isInstance(entity))
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44 {
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45 if (entity.getArea().intersects(hotspotBox)) {
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46 // Found collision, early stop.
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47 return true;
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48 }
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49 }
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50 }
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51
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52 return false;
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53 }
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54
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55
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56 /**
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57 * This function samples a randomized line that contains of x and y values
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58 * between <i>startX</i>, <i>endX</i>, <i>startY</i> and <i>endY</i>. The
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59 * number of points in the line is specified by <i>num</i>.
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60 *
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61 * @param num The number of points in the line.
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62 * @param startX The min value of the x values.
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63 * @param endX The max value of the x values.
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64 * @param startY The min value of the y values.
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65 * @param endY The max value of the y values.
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66 * @return an array with [allX-values, allY-values].
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67 * @throws IllegalArgumentException
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68 */
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69 public static double[][] randomizeLine(
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70 int num,
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71 double startX,
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72 double endX,
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73 double startY,
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74 double endY
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75 ) throws IllegalArgumentException
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76 {
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77 if (num <= 0) {
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78 throw new IllegalArgumentException("Parameter 'num' has to be > 0");
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79 }
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80
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81 Random random = new Random();
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82
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83 double[] x = new double[num];
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84 double[] y = new double[num];
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85
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86 for (int i = 0; i < num; i++) {
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87 double xFac = random.nextDouble();
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88 double yFac = random.nextDouble();
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89
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90 x[i] = startX + xFac * (endX - startX);
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91 y[i] = startY + yFac * (endY - startY);
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92
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93 logger.debug("Created new point: " + x[i] + "|" + y[i]);
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94 }
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95
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96 return new double[][] { x, y };
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97 }
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98
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99
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100 public static StyledXYSeries sampleFunction2D(
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101 Function func,
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102 Document theme,
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103 String seriesKey,
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104 int samples,
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105 double start,
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106 double end
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107 ) {
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108 StyledXYSeries series = new StyledXYSeries(seriesKey, theme);
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109
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110 double step = (end - start) / (samples - 1);
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111
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112 for (int i = 0; i < samples; i++) {
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113 double x = start + (step * i);
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114 series.add(x, func.value(x));
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115 }
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116
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117 return series;
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118 }
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119
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120 public static StyledXYSeries sampleFunction2DPositive(
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121 Function func,
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122 Document theme,
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123 String seriesKey,
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124 int samples,
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125 double start,
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126 double end
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127 ) {
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128 StyledXYSeries series = new StyledXYSeries(seriesKey, theme);
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129
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130 double step = (end - start) / (samples - 1);
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131
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132 for (int i = 0; i < samples; i++) {
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133 double x = start + (step * i);
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134 double v = func.value(x);
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135 if (x > 0d && v > 0d) {
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136 series.add(x, v);
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137 }
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138 }
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139
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140 return series;
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141 }
3018
fb07f936b5ad New helper.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents:
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142 }
3083
4bd3d8bbb60c Added missing vim lines.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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143 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
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